Hey guys, I've been looking around for solutions to this issue, but I haven't been able to find a way to fix it. I've redone my lightmap UVs a few times to test it out, fiddled with lightmass settings, and increased the resolution of the lightmaps pretty high, but I keep getting different shades of grey on each adjacent object.
(this is at lightmap res set to 64, the issue isn't fixed with 128..256 etc.)
here is the unwrap I'm using for the lightmap (for the floor tiles). I had it more tightly packed in a 32x32, but I'm still getting the issue with all of this extra padding:
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I've looked around on other threads, and it seems baking lightmaps in production quality helps ameliorate the situation as well (I tried it, and it does make it much less noticeable). Just edited with this in case this thread turns up in search for someone having the same issue
Here is a quick example after baking lights with default template scene lightmass, using overly simple geo.